72=3x+9

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Solution for 72=3x+9 equation:


Simplifying
72 = 3x + 9

Reorder the terms:
72 = 9 + 3x

Solving
72 = 9 + 3x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3x' to each side of the equation.
72 + -3x = 9 + 3x + -3x

Combine like terms: 3x + -3x = 0
72 + -3x = 9 + 0
72 + -3x = 9

Add '-72' to each side of the equation.
72 + -72 + -3x = 9 + -72

Combine like terms: 72 + -72 = 0
0 + -3x = 9 + -72
-3x = 9 + -72

Combine like terms: 9 + -72 = -63
-3x = -63

Divide each side by '-3'.
x = 21

Simplifying
x = 21

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